 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.preferences.legacy;

 import java.io.IOException ;
 import java.io.InputStream ;
 import java.net.MalformedURLException ;
 import java.net.URL ;
 import java.util.Properties ;
 import org.eclipse.core.internal.preferences.exchange.IProductPreferencesService;
 import org.eclipse.core.internal.runtime.InternalPlatform;
 import org.eclipse.core.runtime.*;
 import org.osgi.framework.Bundle;

 public class ProductPreferencesService implements IProductPreferencesService {

     private static final IPath NL_DIR = new Path("$nl$"); //$NON-NLS-1$

     // declared in org.eclipse.ui.branding.IProductConstants
 public static final String PRODUCT_KEY = "preferenceCustomization"; //$NON-NLS-1$
 private static final String LEGACY_PRODUCT_CUSTOMIZATION_FILENAME = "plugin_customization.ini"; //$NON-NLS-1$
 private static final String PROPERTIES_FILE_EXTENSION = "properties"; //$NON-NLS-1$

     private boolean initialized = false;
     private String customizationValue = null; // it won't change during the product run time
 private Bundle customizationBundle = null;
     private String productID = null;

     private void initValues() {
         if (initialized)
             return;
         initialized = true;

         IProduct product = Platform.getProduct();
         if (product == null) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
                 InternalPlatform.message("Product not available to set product default preference overrides."); //$NON-NLS-1$
 return;
         }
         productID = product.getId();
         if (productID == null) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
                 InternalPlatform.message("Product ID not available to apply product-level preference defaults."); //$NON-NLS-1$
 return;
         }
         customizationBundle = product.getDefiningBundle();
         if (customizationBundle == null) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
                 InternalPlatform.message("Bundle not available to apply product-level preference defaults for product id: " + productID); //$NON-NLS-1$
 return;
         }
         customizationValue = product.getProperty(PRODUCT_KEY);
         if (customizationValue == null) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
                 InternalPlatform.message("Product : " + productID + " does not define preference customization file. Using legacy file: plugin_customization.ini"); //$NON-NLS-1$//$NON-NLS-2$
 customizationValue = LEGACY_PRODUCT_CUSTOMIZATION_FILENAME;
         }
     }

     public Properties getProductCustomization() {
         initValues();
         URL url = null;
         if (customizationValue != null) {
             // try to convert the key to a URL
 try {
                 url = new URL (customizationValue);
             } catch (MalformedURLException e) {
                 // didn't work so treat it as a filename
 url = FileLocator.find(customizationBundle, new Path(customizationValue), null);
             }
         }

         if (url == null) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
                 InternalPlatform.message("Product preference customization file: " + customizationValue + " not found for bundle: " + productID); //$NON-NLS-1$//$NON-NLS-2$
 }

         return loadProperties(url);
     }

     public Properties getProductTranslation() {
         initValues();
         URL transURL = null;

         if (customizationValue != null)
             transURL = FileLocator.find(customizationBundle, NL_DIR.append(customizationValue).removeFileExtension().addFileExtension(PROPERTIES_FILE_EXTENSION), null);

         if (transURL == null && InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
             InternalPlatform.message("No preference translations found for product/file: " + customizationBundle.getSymbolicName() + '/' + customizationValue); //$NON-NLS-1$

         return loadProperties(transURL);
     }

     private Properties loadProperties(URL url) {
         Properties result = new Properties ();
         if (url == null)
             return result;
         InputStream input = null;
         try {
             input = url.openStream();
             result.load(input);
         } catch (IOException e) {
             if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES) {
                 InternalPlatform.message("Problem opening stream to preference customization file: " + url); //$NON-NLS-1$
 e.printStackTrace();
             }
         } finally {
             if (input != null)
                 try {
                     input.close();
                 } catch (IOException e) {
                     // ignore
 }
         }
         return result;
     }

 }

